Dog for grinding machines



- May 11 1926. 1,583,940

A. P. STEINER DOG FOR GRINDING MACHINES Filed June 20, 1924 ymoszstemer 1 Patented May 11, 1926.

umrsn orrice.

AMOS P. STEINER, OF ,WAYNESBOBIO, PENNSYLVANIA, ASSIGNOR TO LANDIS TOOL COMPANY, OF WAYNESBORO, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

Doe ron GRINDING MACHINES.

Application filed June 20, 1924. Serial No. 721,290.

My said invention relates to a trip or dog intended primarily for use in grinding machines where a reciprocating element acts on a reversing lever to change the direction of a travel of a reciprocating carriage at predetermined intervals. In the present instance such a reversal occurs after four strokes of the carriage ineach direction and the reversal is preceded by a slow additional movement in the direction of the last stroke as more fully explained in my copending' application No. 721,292 of even dateherewithr 1 Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, V

Figure 1 is an elevation of my invention in a preferred form thereof,

Figure 2, a section on line 22 of Figure 1,

Figure 3, a detail of a part illustrated in Fig. 1, and

Figure 4E, an elevation of a device par tially shown in Figure 1.

In the drawings reference character indicates a part of a rack used in certain types of grinding machines said rackhaving oblique teeth at its upper side meshing with a worm 11' by means of which the dog 12 can be adjusted bodily along the racle The dog includes a vertically movable slide 13 normally held down by a spring 14 in a dotted lines in Figure 1, said block forming positionato engage a block 15 shown in stationary pawl 18 here shown as pivoted at 19 on a horizontally adjustable support 20.

A spring 21 is secured at one end to a'bolt Y 22 projecting from the support 20 to which it is adjustably secured and said spring at its other end is attached to an upwardly extending arm 23 integral with the pawl 18. It will be seen that as the dog reciprocates the pawlengages successively with different teeth and must swing downward to pass the teeth of the ratchet which necessitates the of the slide in the direction of operation of the dog there is another slide 26 squared at its lower end and guided by means of a slot 27 cooperating with a pin 28 projecting ,a

through the front plate. A. spring 29 surrounding a reducedpart of the-latter slide bears at one end against a fixed part of the dog and at the other end against a shoulder on the slide 26. A head 30 on the slide limits its downward movement and serves as means by which the slide may be lifted whenit is desired to have the lower end of the slide pass over the block 15 without engagement therewith.

In the operation of. my device the dog travels from the position shown in Figure 1 toward the right as indicated by thearrow 31, the vertical line at the end of the arrow indicating the farthest position of the axis of the shaft 32 which forms the pivot of the cam and the ratchet and which also, coacts with a slot 33 in the slide 13 for guidinglthe slide and supporting it in place. When the dog reaches its limit of movement as above described one. of the teeth 17 will have been engaged by the pawl 18 and the ratchet will have been rotated through an arc of 90 degrees which may of course be varied for a different number of strokes of the reciproeating element as desired. Assuming the. tooth first engaged to be the one corresponding to the lowest part of the cam the slide 13 will now havebeen raised a short-distance by the cam. At each succeeding stroke to ward the right the slide will be raised until at the fourth stroke it is high enough to pass over the block 15 whereupon the dog and the carriage supporting it will continue to move to the left until the reversinglever is thrown by means of the flattened lower end of slide 26. On the ensuing stroke of the carriage toward the right the pawl 18 will engage the tooth corresponding to the high part of the cam 16 and will move the cam so far that the slide 13 will ride ofi the high part of the cam and return to the lowest part of the same whereupon the sequence of operations will be resumed.

The lower ends of the slides provide movable abutments for actuating a device here indicated as a. reversing lever, but which might be any other device which is to be moved at intervals. The abutments" may also be varied in shape and other details. It will be obvious to those skilled in the art that many other changes may be made in my device without departing from the spirit of the invention and thgrefore I donot limit myself to what is shown in the drawings and described in the specification, but only as indicated in the appended claims.

Having thus fully described my said in vention, what I claim as new and desire to secure by Letters Patent is:

1. In combination, a reversing lever and an actuating dog therefor said members having relative reciprocatory movement, an element on the dog slidable transversely of the line of such movement, a cam, and means for moving the cam on successive reciprocatory movements to move said slidable element out of the path of the reversing lever, substantially as set forth. 7

2. A reversing dog comprising a slide adapted to engage a reversing lever in one position, a cam engaging said slide, a ratchet concentric with and fixed to said cam, and a stationary pawl adapted to engage the ratchet on successive movements of the carriage in one direction, substantially as set forth. y

3. A reversing dog comprising a vertically movable slide normally adapted to engage a movable device during a movement of translation of the dog, a spring normally holding the slide in its lowest position, a cam for raising it, and means for moving the cam step-by-step toward its highest position, substantially as set forth.

4. In combination, a reversing lever, a reversing dog, a slide on the. dog adapted to engage and .actuate the reversing lever, a spring normally holding the slide 111 engaging position, a cam for moving the slide out of such position, and pawl and ratchet mechanism for moving the cam through successive cycles to move the slide automatically out of such engaging position and thereafter release it, substantially as set forth.

5. A reversing dog comprising a vertically movable slide adapted to engage a reversing lever, a spring normally holding the slide in its lowest position, a cam for lifting the slide, pawl and ratchet mechanismfor moving the cam through successive cycles to raise the slide automatically and thereafter release it, and an abutment on the dog adapted to engage the reversing lever after said slide has passed the normal engaging posi tion, substantially as set forth.

6. A reversing dog comprising'a vertically movable slide adapted to engage a reversing lever, a spring normallyrholding the slide in itslowest position, a cam for lifting the slide, pawl and ratchet mechanism for moving the cam through successive cycles to raise the slide automatically and thereafter release it, an abutment on .the dog adapted to engage the reversing lever after. saidfslide has passed the normal engaging position,

and means whereby said abutment may be moved out of the .path ofthe reversing le ver, substantially as set forth. i

7. A reversing dog comprising avertically movable slide adapted to engage a reversing out of the path of the reversing lever said abutment having a fiat face for engaging the lever, and means to insure engagement of said fiat face with the lever, substantially asset forth.

S. In combination, a lever, a dog having I relative to and fro movement pastthe lever, a slide on the dog for. actuating saidlever, manual means for moving the slide out of actuating position, a spring for normally holding the slide in actuating position, a fiat face at the lower end of the slide for engaging said lever, and means to prevent rotation of the slide, substantially as set forth.

9. A log adapted to be attached to an element of a machine, an abutment on thcdog normally positioned to strike another ele ment of such machine, having reciprocatory movement relatively to the first element, and means controlled by such relative movement for intermittently removing saidv abutment automatically returning said abutment to such engaging relation, substantially as set forth.

11. A dog adapted to be attached to a 5 movable element of a machine, an abutment on the dog normally positioned to move another element of such machine, means controlled by the movement of the first-named element for intermittently removing said 19 abutment out of engaging relation With said second element, and a second abutment on the dog adapted to engage said second element when the first dog is out of such engaging relation, substantially as set forth.

In Witness whereof, I have hereunto set my hand and seal at W'aynesboro, Pennsylvania this 17th day of June, A. D. nineteen hundred and twenty-four.

AMOS P. STEINER. 1,. 8.] 

